Great Britain vs rag day

Great Britain and rag day both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
rag day	Yes	No	No	No

Great Britain (noun)	rag day (noun)
an island comprising England and Scotland and Wales	a day on which university students hold a rag
a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom